将关联排序与ArangoDb中的单词前缀搜索结合在一起？

Question

In ArangoDB, I'm using a search view that sorts results using BM25 , something like:

FOR doc IN someView
SEARCH ANALYZER(doc.description == 'foo', 'text_en')
SORT BM25(doc)
RETURN doc

This only performs full word searching though (ie will not match documents containing eg "foot", "a football"), so I'd like to use word prefix searching instead.

I know this can be done with FULLTEXT indexes, eg:

FOR doc IN FULLTEXT(someCollection, "description", "prefix:foo")
RETURN doc

but then I lose the relevance sorting.

Is there a way to combine both of these so that I can perform partial word matching, but also get results ordered by relevance?

Answer 1

You can use STARTS_WITH function, eg

FOR doc IN someView
SEARCH ANALYZER(STARTS_WITH(doc.description, 'foo'), 'text_en')
SORT BM25(doc)
RETURN doc

For more functions supported by ArangoSearch please check the documentation: https://www.arangodb.com/docs/stable/aql/views-arango-search.html